高含量稀土混合铸造 AZ61 镁合金室温显微组织和性能分析与讨论

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-02-28 DOI:10.1007/s11223-024-00612-0
F. H. Cao, Y. Zhang, Y. Chen, M. G. Jiang, J. L. Zhou, Y. He
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摘要

本文通过光学显微镜、扫描电镜、EDS 和 XRD 系统分析和讨论了稀土含量为 1.0~4.0 wt.% 的铸态 AZ61 镁合金的显微组织和力学性能。结果表明,在铸造的 AZ61 合金中,除了明显分布着骨架β-Mg17Al12 相外,还分布着少量的 Mg32(Al,Zn)49 准晶相。随着稀土含量的增加,铸态 AZ61 镁合金基体中的骨架 β-Mg17Al12 相枝晶分解明显。随着稀土含量的增加,枝晶的分解更为严重,准晶 Mg32(Al,Zn)49 也随之消失。当稀土含量为 1%Ce~2%Ce时,合金主要由针状、点状或团状的 Al4Ce 和 Al8Mn4Ce 相组成,并含有少量的 Al4La。当加入 2.8%Ce+1.2%Nd 混合稀土时,合金中不存在 Al8Mn4Ce 相,而主要由 Al3Nd 和 Al4Ce 稀土相组成。这些稀土相有辐射针状、柳叶状、棒状、点状、层状和少量不规则块状。铸造的 AEZ641(2.8 wt.% Ce+1.2 wt.%钕)镁合金综合性能最好,屈服强度比铸造的 AZ61 合金高 2%。其抗拉强度、硬度和伸长率与铸造的 AZ61 合金相似。铸态 AZ61 + xRE 的断裂机理主要是劈裂型脆性断裂。
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Analysis and Discussion on the Room Temperature Microstructure and Properties of High Content Mixed Rare-Earth As-Cast AZ61 Magnesium Alloy

This paper systematically analyzed and discussed the microstructure and mechanical properties of as-cast AZ61 magnesium alloy with rare-earth content of 1.0~4.0 wt.% by optical microscopy, SEM, EDS, and XRD. The results indicate that in addition to the obvious distribution of skeletal β-Mg17Al12 phase, a small amount of Mg32(Al, Zn)49 quasicrystal phase is distributed in as-cast AZ61 alloy. With the addition of rare-earth content, the skeletal β-Mg17Al12 phase dendrites in the as-cast AZ61 magnesium alloy matrix are decomposed obviously. The dendrite decomposition is more serious with increased Rare-earth content, and the quasicrystal Mg32(Al, Zn)49 disappears. When the rare-earth content is 1%Ce~2%Ce, the alloy mainly consists of needle-like, dot-like, or clustered Al4Ce and Al8Mn4Ce phases with a small amount of Al4La. When 2.8%Ce+1.2%Nd mixed rare-earth was added, the Al8Mn4Ce phase was not found in the alloy but mainly composed of Al3Nd and Al4Ce rare-earth phases. These rare-earth phases were radiative needle-like, willow leaf-like, rod-like, spot-like, layer-like, and a little irregular block. The as-cast AEZ641(2.8 wt.% Ce+1.2 wt.% Nd) magnesium alloy has the best comprehensive performance, and the yield strength is 2% higher than the as-cast AZ61 alloy. Its tensile strength, hardness, and elongation are similar to as-cast AZ61 alloy. The fracture mechanism of as-cast AZ61 + xRE is mainly a cleavage-type brittle fracture.

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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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